Self-healing composition for the inner tubes of tires.



Jenner. cnann, or srnnrnfarr, new nmrrsnrnnj SELF-HEALING- COMPOSITION-INNER TUIBE$ 0F TIRES.

neonate-.-

Ito Drawing.

To all whom it may concern:

Be it 'known that 1, JAMES P. CLARE, of Stratham, in the county ofRockingham and State of New Hampshire,.a citizen of the United States,have invented a new and useful Improvement in Self-Healing Compo- Isitions for the Inner Tubes of Tires, of which the following is a full,clear, and exact description, reference being had to the acconr panyingdrawings, forming a part of this specification, inexpl'aining 1tsnature.

The present invention relates to a selfhealing composition or fillingfor the inner tubes 'of'tiresyand constitutes an improvement upon theself healiug composition described in my Letters Patent of theUnitedStates No.1 1,137,461,0f April 27,- 191-5:

The object of mypresent invention, like 1 the object of the invention of'saidpatent, is'

to provide a, self-healing composition which willperform the functionforwhich it is designed and which will retain its character and usefulnessduring the life of the tube or density' and viscosity of body and onefree from pores. In this connection I would explain-that while thecomposition referred to in my said patent makes a superior product,

entirely suitable for the purpose for whichmoisture in certain of theelements employed. This trapped moisture is converted 'into steam duringthe vulcanization of the tube, for it will be understood that thefilling is placed in the tube before the'tu'be is vulcanized, and it isthe expanding steam which leaves the pores in the filling.

to The present composition consists of a mix- 7 Specification of LettersPatent.

re. ltis my further object in the present connect onto provlde acomposition of superlor' Patented New dd, t.

Application filed time 1, 1916. s amina. cater.

ture of reclaimed rubber, atar free from moisture such as pine tar and asoftening agent freefrom moisture such as palm oil. These ingredientsare the usual commercial products although i prefer to employ a reclaimed rubber which'has been made as free as possible from all foreignsubstances and which has been ground exceedingly fine.

In preparing the composition 1 prefer to use theingredients in aboutthe-following p1'0P0It10I1S viz: ten pounds of reclaimed rubbentwopounds of -tar and cnepound of palm oil. have, hotvevenobtainedexcellent results-by using but (one pound of tar and one halfgalfpoundof palmgoil to the ten pounds of reclaimed rnbber. 'flln fact, theproportions will depend largely upon the results'desired to be obtained.s'ihe ingredients. aremixed togetherin a common type of rubber millhaving heated. 'rolls.

My'present composition has a dense, semi plastic andsemi-elasticconsistency; it is exceedingiy tacky and freelfrorn allpo'res,retai'ning these characteristics when heated in contact with rubbercontaining suifur.

'Having thus fully describedmy invention, 1 claim anddesire to secureby'Let-ters Patent of the United States 1. A mlf-healing composition forthe inner tubes of tires comprising a mixture of reclaimed rubber, tarfree from moisture and a softening agent free from moisture, saidcomposition having a dense, semi-plastic and semi-elastic, tackyconsistency'and retaining these properties when heated in contact withrubber containing sulfur.

2. A self-healing composition for the inner tubes of tires comprisingreclaimed rubber, pine tar and palm oil, the mixture having a dense,semi-plastic, semi-elastic, tacky consistency free from pores andretaining these properties when heated in contact with rubber containingsulfur.

inns r. CLARE.

' flopiea of this patent may be obtained vfor five cents each, 'byaddressing the flommiscioner ct ratentc,

Washington, 1'. G.

